Investment Securities - Schedule of Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Available-for-sale securities
Due in one year or less, amortized cost	$ 145,856	$ 53,162	$ 93,724
Due in one to five years, amortized cost	139,409	132,348	138,704
Due in five to ten years, amortized cost	84,756	82,040	41,655
Due after ten years, amortized cost	19,043	18,705	64,452
Amortized Cost	4,906,690	3,979,814	4,018,851
Due in one year or less, fair value	145,599	52,945	93,137
Due in one to five years, fair value	131,506	123,985	126,776
Due in five to ten years, fair value	79,216	76,869	36,315
Due after ten years, fair value	16,166	15,782	57,518
Fair Value	4,329,957	3,502,915	3,492,481
Held-to-maturity securities
Held-to-maturity securities, due in one year or less, amortized cost	8,356	5,169	2,479
Held-to-maturity securities, due in one to five years, amortized cost	114,457	109,602	102,182
Held-to-maturity securities, due in five to ten years, amortized cost	85,507	99,700	106,708
Held-to-maturity securities, due after ten years, amortized cost	351,737	352,474	362,252
Amortized Cost	3,756,415	3,857,263	3,564,879
Less: Allowance for credit losses	(491)	(347)	(406)
Held-to-maturity securities, net of allowance for credit losses	3,755,924	3,856,916	3,564,473
Held-to-maturity securities, due in one year or less, fair value	8,213	5,142	2,475
Held-to-maturity securities, due in one to five years, fair value	109,845	105,835	96,806
Held-to-maturity securities, due in five to ten years, fair value	82,499	98,718	105,054
Held-to-maturity securities, due after ten years, fair value	278,727	283,506	289,426
Fair Value	3,060,467	3,215,468	2,887,891
Mortgage-backed
Available-for-sale securities
Mortgage-backed, without single maturity date, amortized cost	4,517,626	3,693,559	3,680,316
Mortgage-backed, without single maturity date, fair value	3,957,470	3,233,334	3,178,735
Held-to-maturity securities
Mortgage-backed, amortized cost	3,196,358	3,290,318	2,991,258
Mortgage-backed, fair value	$ 2,581,183	$ 2,722,267	$ 2,394,130